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catalogue Foreword 1.LAMP introduction and overview 2.Apache 2.1Apache origin 2.2 introduction to Apache 3.httpd  3.1 compiling and installing httpd server 3.2 compiling and installing httpd server 4. Install MYSQL 4.1 installing MYSQL 4.2sql_ The common values of mode are as follows: 4.3 setting environment variables  5. Inst ...

1, echarts line chart (line chart) Line chart is also one of the most commonly used charts in our data visualization charts. It is a chart that connects various data point marks with line. It can not only represent the number, but also reflect the development and change situation and change trend of the same thing at different times. Looking ...

catalogue preface 1. Restrict a prop to a list of types 2. Use quotation marks to listen for nested attributes 3. Know when to use v-if 4. Abbreviation for a single scope slot 5. Mix local and global style s 6. Override styles for subcomponents 7. How to create a responsive variable outside Vue 8. Deconstruction in v-for 9. Cycle with ...

1, while loop statement 1. Loop: execute a piece of code repeatedly + the loop in the code is counting + determine the number of cycles by changing the number 2. Three elements of circulation 2.1 start: count from what 2.2 end: count to the end 2.3 step length: interval of counting 3.while statement format 3.1 while {code snippet} 3.2 ...

The most common way of communication between services is to call each other directly to communicate. Instant messaging (synchronous communication) refers to that a message can reach the other end immediately after it is sent from one end. After a message is sent from one end, it first enters a container for temporary storage. When certain con ...

1, Introduction It's best to familiarize yourself with CyclicBarrier before you understand it CountDownLatch The two tool classes can achieve the effect of thread waiting, but their focus is different. CountDownLatch can only be used once. When its counter is 0, it will wake up all waiting threads in the synchronization queue, and then it will ...

Redis master-slave replication brief introduction The read-write capability supported by a single redis is still limited. At this time, we can use multiple redis to improve the concurrent processing capability of redis. How these redis cooperate requires a certain architecture design. Here, we first analyze and implement the master / slave ar ...

By default, when the watermark passes through the end of window and the previous data arrives, these data will be deleted. In order to avoid some late data being deleted, the concept of allowed lateness is generated. In short, allowed latency is for event time. After the watermark exceeds the end of window, it is also allowed to wait for a pe ...

Basic knowledge of documents What is a file? This is very simple. We usually click the right mouse button and create a new folder. This is to create a file. For example, each folder in our disk is a file. We usually give a meaningful file name to prevent it from being found next time. Why use files? For example, when we write an address boo ...

Chapter 7 single line function 1. Understanding of function 1.1 what is a function Function runs through the use of computer language. What is the role of function? It can encapsulate the code we often use and call it directly when necessary. This not only improves the code efficiency, but also improves the maintainability. In SQL, we can al ...